Smith Lake
Smith Lake in Washington County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4 ft visibility. Maximum depth: 5 ft. Surface area: 85 acres.
Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Smith Lake. DNR survey details →
- Clarity
- 4 ft
- Typical in August
- 76°F
- Max depth
- 5 ft
- Area
- 85 acres
- Trend
- → Stable
- Public access
- Yes
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Why Smith Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Smith Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Smith Lake is a 85-acre lake in Washington County, Wisconsin with a maximum depth of 5 feet. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-13. Grade methodology: LakeQuality methodology.
Watch Smith Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Smith Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4 ft. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Smith Lake
Compare lakeside cabins, hotels, and vacation rentals near Smith Lake in Washington County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Smith Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Smith Lake typically sits around 76°F at the surface in August. Summer average is about 75°F. Usually warmest in Jul (about 76°F) and coldest in Oct (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 104 field readings (2025–2026) via the EPA Water Quality Portal. See the full Smith Lake water temperature breakdown →
Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Smith Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Smith Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2025. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 5 ft |
| Surface Area | 85 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Smith LakePublic
- Wallace LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Smith Lake
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | 0 m/yr | 2 |
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Smith Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Kewaskum Wastewater TreatmentKewaskum, Village Of · 3.1 mi away · NPDES WI0021733Recent violation
- Kettle Moraine Egg Ranch LlcKewaskum · 4.3 mi away · NPDES WI0056677Recent violation
- Interstate Oil, Inc.Shorewood · 3.6 mi away · NPDES IL0072702
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Smith Lake
Smith Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Washington County
Frequently asked questions about Smith Lake
Where is Smith Lake?
- Smith Lake is a lake in Washington County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Smith Lake?
- Smith Lake in Washington County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4 ft visibility. Maximum depth: 5 ft. Surface area: 85 acres.
Is Smith Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Smith Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Smith Lake?
- Smith Lake typically sits around 76°F at the surface in August, from 104 EPA Water Quality Portal field readings (2025–2026). That is a typical value for the month, not a live reading.
How deep is Smith Lake?
- Smith Lake has a maximum depth of 5 feet. The lake covers 85 acres.
What fish are in Smith Lake?
- Fish species found in Smith Lake include Panfish, Largemouth Bass, Northern Pike. Smith Lake is located in Washington County, Wisconsin.
What did the DNR fisheries survey find at Smith Lake?
- Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Smith Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Smith Lake — official chemistry is on file, not a letter, and the water-quality trend over 2 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Smith Lake?
- Smith Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Smith Lake, Wallace Lake. Public access is listed as yes.
Explore Smith Lake across LakeQuality
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Where this data comes from
29 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX29 samples · 2025–2026
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory